each vs inject vs map

output

Running 100000 iterations...
each:   6.872149
inject: 6.868875
map:    0.093785

time.rb

ITERATIONS = 100000                                                                                                                                                                                             
                                                                                                                                                                                                                
puts "Running #{ITERATIONS} iterations...\n"                                                                                                                                                                    
                                                                                                                                                                                                                
def time(&block)                                                                                                                                                                                                
  start = Time.now                                                                                                                                                                                              
  block.call                                                                                                                                                                                                    
  puts Time.now - start                                                                                                                                                                                         
end                                                                                                                                                                                                             
                                                                                                                                                                                                                
time do                                                                                                                                                                                                         
  text = ''                                                                                                                                                                                                     
  1.upto(ITERATIONS).each { |i| text += "#{i} " }                                                                                                                                                               
  print "each:\t"                                                                                                                                                                                               
end                                                                                                                                                                                                             
                                                                                                                                                                                                                
time do                                                                                                                                                                                                         
  1.upto(ITERATIONS).inject(''){ |text, i| text += "#{i} " }                                                                                                                                                    
  print "inject:\t"                                                                                                                                                                                             
end                                                                                                                                                                                                             
                                                                                                                                                                                                                
time do                                                                                                                                                                                                         
  '' + 1.upto(ITERATIONS).map { |i| i }.join(' ')                                                                                                                                                               
  print "map:\t"                                                                                                                                                                                                
end